如何从http服务获得准确响应

在我的应用程序中，我在我的应用程序中使用 http 服务，我必须使用一个编辑文本和两个按钮（预览按钮、发送按钮）。当我单击预览按钮时，http 请求将与编辑文本的内容一起建立。我想在对话框中显示响应和编辑文本内容。

此网址： “ http://invitations.in/events/register/credit.php?template= ” + sms_content

这是回应：

{“学分”：2}

这是我的代码：

 editText = (EditText)findViewById(R.id.sms_content);

        preview_btn = (Button) findViewById(R.id.preview_btn);
        send_btn = (Button) findViewById(R.id.send_btn);

        send_btn.setVisibility(View.GONE);
        preview_btn.setVisibility(View.VISIBLE);

        preview_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                sms_content = editText.getText().toString();

                // get prompts.xml view
                LayoutInflater li = LayoutInflater.from(context);
                View promptsView = li.inflate(R.layout.prompts, null);

                AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                        context);

                // set prompts.xml to alertdialog builder
                alertDialogBuilder.setView(promptsView);

                 TextView preview = (TextView) promptsView
                        .findViewById(R.id.preview);
                 TextView smscount = (TextView) promptsView.findViewById(R.id.count_credits);
                 TextView numofcont = (TextView) promptsView.findViewById(R.id.no_ofcont);

                Thread thread = new Thread(new Runnable() {

                    @Override
                    public void run() {
                        try {
                            try {
                                sms_content = URLEncoder.encode(sms_content, "UTF-8");
                            } catch (UnsupportedEncodingException e) {
                                e.printStackTrace();
                            }
                            try {
                                HttpClient httpClient = new DefaultHttpClient();
                                HttpGet httpPost = new HttpGet("http://v.leonas.in/events/register/credit.php?template="+sms_content);
                                HttpResponse response = httpClient.execute(httpPost);
                                HttpEntity entity = response.getEntity();
                                String responseString = EntityUtils.toString(entity);
                                JSONObject jsonObject = new JSONObject(responseString);
                                creditspersms = jsonObject.getInt("credits");
                                System.out.println(creditspersms);

                            } catch (JSONException e) {
                                e.printStackTrace();
                            } catch (ClientProtocolException e) {
                                e.printStackTrace();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                });
                thread.start();

                preview.setText(sms_content);
                smscount.setText(String.valueOf(creditspersms * contnum));
                numofcont.setText(Integer.toString(contnum));

                // set dialog message
                alertDialogBuilder
                        .setCancelable(false)
                        .setPositiveButton("OK",
                                new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface dialog,int id) {
                                        // get user input and set it to result
                                        // edit text
                                        editText.setText(editText.getText());
                                        send_btn.setVisibility(View.VISIBLE);
                                        preview_btn.setVisibility(View.GONE);
                                    }
                                })
                        .setNegativeButton("Cancel",
                                new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface dialog,int id) {
                                        dialog.cancel();
                                    }
                                });

                // create alert dialog
                AlertDialog alertDialog = alertDialogBuilder.create();
                // show it
                alertDialog.show();
            }
        });

在这里，当我单击预览按钮时，它正在点击 URL 并从中获得响应。但是在警报对话框中，响应显示为 0。如果我取消对话框并再次单击预览按钮，它会给出我想要的确切输出。但我想在我第一次点击时出现这个，请帮我解决这个问题。